The meter can measure current total active energy, current balance, instantaneous voltage, instantaneous current, instantaneous power and has the function of STS prepayment, LCD display, event record, opto-electrical communication, acousto-optic alarm, relay control, etc. It has stable performance, high accuracy and easy to operate.

During meter's work period, after sampling respectively by sampling circuit, voltage and current will be sent to the MCU which has SOC to analyze and process and then realize the function of measuring energy and display,store and transer.The microcontroller shown in the figure can control LCD, relay, LED and buzzer and make alarm according to the preset power threshhold and balance alarm. It can transfer the data and event log to the external PC devices by opto-electrical communication.